ozone: Implement zero/one-copy texture for Ozone GBM.

ui/ozone/public/native_pixmap_manager.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_OZONE_PUBLIC_NATIVE_PIXMAP_MANAGER_H_
 #define UI_OZONE_PUBLIC_NATIVE_PIXMAP_MANAGER_H_
 
 #include "ui/ozone/ozone_export.h"
+#include "ui/ozone/public/native_pixmap.h"
 #include "ui/ozone/public/surface_factory_ozone.h"
 
 namespace base {
 
 struct FileDescriptor;
 
 }  // namespace base
 
 namespace ui {
 
 // The Ozone interface allows external implementations to hook into Chromium to
 // provide the handle of a system specific surface implementation for Browser
 // and Render process.
 class OZONE_EXPORT NativePixmapManager {
  public:
   static scoped_ptr<NativePixmapManager> Create(
       const base::FileDescriptor& device_fd);
 
   virtual ~NativePixmapManager();
 
   struct Configuration {
     SurfaceFactoryOzone::BufferFormat format;
     SurfaceFactoryOzone::BufferUsage usage;
   };
 
   // Gets supported format/usage configurations.
   virtual std::vector<Configuration> GetSupportedNativePixmapConfigurations()
       const = 0;
 
+  // Create a single native buffer from |handle| to be used for zero copy in
+  // Browser or Render process.
+  virtual scoped_refptr<NativePixmap> CreateFromFileDescriptor(
+      base::FileDescriptor handle,
+      gfx::Size size,
+      SurfaceFactoryOzone::BufferFormat format,
+      SurfaceFactoryOzone::BufferUsage usage) = 0;
+
  protected:
   NativePixmapManager();
 
   virtual void Initialize(const base::FileDescriptor& device_fd) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NativePixmapManager);
 };
 
 // Platforms which don't need to share native pixmap use this.
 NativePixmapManager* CreateStubNativePixmapManager();
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PUBLIC_NATIVE_PIXMAP_MANAGER_H_